#include <iostream>
using namespace std;

int main(int argc, char const *argv[])
{
    cout<<"hello world"<<endl;
    cout<<"修改"<<endl;
    cout<<"这里是b"<<endl;
    cout<<"master修改"<<endl;
    cout<<"master修改2"<<endl;
    cout<<"a创建新分支branch_a4"<<endl;
    return 0;
}